The meaning of SILL is a horizontal piece (such as a timber) that forms the lowest member or one of the lowest members of a framework or supporting structure.

Fort Sill’s official website with news, events, and information about the post and the people who serve and work here.

sill noun (ROCK LAYER) [ U ] earth science us / sɪl / a layer of rock that is created when hot melted rock forces itself into spaces between other rock, then cools and becomes solid …

Definition of sill noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

A sill is a shelf along the bottom edge of a window, either inside or outside a building. Whitlock was perched on the sill of the room's only window. Collins COBUILD Advanced Learner’s …

sill, n.¹ meanings, etymology, pronunciation and more in the Oxford English Dictionary

Oct 31, 2025 · (construction) A threshold; horizontal structural member of a building near ground level on a foundation or pilings, or lying on the ground, and bearing the upright portion of a …

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sill (sɪl) n. 1. a horizontal piece or member beneath a window, door, or other opening.

SILL definition: Mount, a mountain in E central California, in the Sierra Nevada Mountains. 14,153 feet (4,314 meters). See examples of Sill used in a sentence.